A dockyard, in the context of naval architecture, is a sophisticated facility or a designated area, generally positioned near a body of water, which is primarily utilized for the construction, maintenance and repair of water vessels such as ships and boats. These specialized areas typically have all the necessary infrastructure, equipment, and skilled workforce to carry out tasks such as shipbuilding, refitting, renovation, and even the dismantling of obsolete vessels, in the most efficient and secure way possible. The dockyard may also facilitate dry-docking, where the water can be drained to allow inspection, maintenance and repairs of the submerged parts of the watercraft. It may also include storage spaces for spare parts and naval supplies, as well as administrative and support services for the crews of the vessels.

1. BAE Systems Portsmouth Dockyard: One of the historic dockyard facilities in Portsmouth, England, it is a significant part of UK’s naval history as it was the place where numerous battleships were built and repaired. It continues to offer naval shipbuilding and repair works. 2. Brooklyn Navy Yard: Located in New York City, this dockyard was once a major hub for the United States Navy. Today, it still serves as a site for ship building, repair and conversion of a variety of vessels. 3. Singapore's Sembcorp Marine Ltd: This renowned dockyard company specializes in the repair, conversion and upgrading of a wide range of vessels. It also builds and repairs oil rigs and offshore platforms, making it one of Asia’s biggest dockyard facilities. 4. Kawasaki Shipbuilding Corporation in Japan: As one of the world's leading shipbuilders, this dockyard constructs a variety of ships, including LNG carriers, LPG carriers, bulk carriers and cruise ships. It also handles a substantial amount of repair and upgrading duties for existing vessels. 5. Damen Shipyards in the Netherlands: This internationally known shipbuilding and dockyard company designs, builds, and repairs various types of vessels, including tugboats, workboats, naval vessels and passenger ships. The facility is known for its focus on quality and technologically advanced shipbuilding processes.

Dockyards are foundational to naval history, dating back to the Roman Empire. One significant dockyard is the Royal Naval Dockyard in Hampshire, England. Established in the late 15th century, it's one of the oldest in the world, and when in full operation, can facilitate the construction or repair of over a hundred boats at once. This historic yard played an instrumental role in many naval battles - most notably the Battle of Trafalgar in 1805. Here, the famed HMS Victory, commanded by Admiral Lord Nelson, was built. Today, many dockyards, including this one, serve as popular tourist attractions, revealing a fascinating glimpse into maritime history and engineering.